JPH0420873Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a pantograph type jack, and particularly to a connection structure between an equalizer and a link.

Prior Art A type of jack for lifting heavy objects such as automobiles has (a) at least one pair of links and (b) two connecting pins parallel to each other, and one end of the pair of links is connected to each of the connecting pins. (c) having meshing teeth along arcs centered on the two connecting pins, respectively;
a pair of equalizers provided at the one ends of the pair of links and meshed with each other to equalize the inclination angles of the pair of links with respect to the connecting member, the other end of the pair of links; There is a pantograph-type jack that raises and lowers heavy objects by changing the height by moving parts closer and farther apart.

By the way, a large load moment is applied to the equalizer of such a pantograph type jack, and high mechanical strength is required. For this reason, the equalizer is generally constructed separately from the link, and is usually fixed to one end of the link by welding.

However, when the equalizer and the link are fixed by welding in this way, the mechanical strength of the equalizer and the link is impaired due to the influence of heat and the notch provided for inserting the welding torch.
There was an inconvenience that the manufacturing cost of the jack increased due to the welding cost. Further, since the spanner sticks to the links, it is necessary to perform a troublesome work to remove it.

On the other hand, the back part of the flat equalizer on which the meshing teeth are formed is in contact with the back part of the link, and is supported through the link together with the connecting pin, and is spaced apart from the pin penetration part in the longitudinal direction of the link. The equalizer is integrally connected to the link without welding by fitting the hole provided in the equalizer with the protrusion provided on the side of the link at the position and pressing the equalizer against the side of the link using a spacer. This is disclosed, for example, in Japanese Utility Model Application Publication No. 58-158091.

Problems to be Solved by the Invention However, in such a conventional coupling structure between a link and an equalizer, the equalizer must be pressed against the side of the link using a spacer, which results in a large number of parts and a complicated structure. There was a problem. In addition, with the hole of the equalizer and the protrusion of the link fitted, a spacer is inserted between the equalizer and the other side of the link, and the pins formed on the spacer, equalizer, and link are inserted. Because it is necessary to align the holes with each other and insert the connecting pin, the assembly work is troublesome and time-consuming.

Note that if an equalizer is provided only on one side of the link as described in the above publication, a torsional moment will act on the link, which is undesirable.To avoid this, a pair of equalizers is provided on both sides of the link. If you try to set it up, the above problem becomes even more obvious. If the fitting structure between the hole and the protrusion is omitted, a single equalizer with a U-shaped cross section can be used and no spacer is required. However, the work involved in joining them together is still troublesome.

Means for Solving the Problems The present invention was made to solve the above problems, and its gist is that (a) at least one pair of links and (b) two connections are provided. a connecting member having a pin; and (c) a pair of equalizers having meshing teeth and provided at one end of the pair of links; (d) at least one end of the link has a U-shaped cross section with both sides bent at a substantially right angle; The section is provided with a burring hole through which a flange protrudes inward to allow the connecting pin to pass through, while (e) the equalizer has a cross-sectional shape having the meshing teeth on both sides bent at a substantially right angle. The U-shaped back part of the link is arranged inside the link in such a manner that the back part of the U-shaped back part is in contact with the U-shaped back part of the link in the longitudinal direction of the link. A U-shaped cutout is provided that is parallel to the back and has an opening on the side corresponding to the other end of the link, and the link is inserted from one end to the other end with the backs parallel to each other. As a result, the flanges are engaged in the notches, and together with the back portions being in contact with each other, they are coupled to the links in a relatively non-rotatable manner.

Function In such a pantograph type jack, both the link and the equalizer have a U-shaped cross section, and the equalizer moves from one end of the link to the other end with the backs of the U-shapes parallel to each other. By inserting the equalizer toward the front side, the flanges of the burring holes provided on both sides of the link are engaged in the notches provided on both sides of the equalizer, and the backs are brought into contact with each other. The equalizer and the link are coupled so that they cannot rotate relative to each other.

Furthermore, when connecting one end of the link to the connecting member, it is sufficient to align the burring hole of the link with the pin insertion hole provided in the connecting member and insert the connecting pin therethrough. In this assembled state, the equalizer can move relatively in the direction of coming out from one end of the link, but the meshing teeth of the equalizer disposed on the pair of links mesh with each other, causing the notch in the equalizer to is pressed against the flange of the link, so the equalizer will not separate from the link.

Effects of the invention As described above, according to the pantograph type jack of the present invention, it is possible to connect the link without relative rotation by simply inserting an equalizer from one end of the link, so the structure is simple with a small number of parts, and both The assembly work becomes extremely easy, and manufacturing costs are significantly reduced. Even in the work of connecting the link to the connecting member, it is only necessary to match the burring hole of the link with the pin insertion hole of the connecting member, so it can be easily and quickly performed.

In addition, the equalizer has a U-shape and meshing teeth are provided on both sides of the equalizer, so it can withstand a large load moment and the load acts equally on both sides of the link. This means that no torsional moment is added.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

In FIG. 1, four lower links 1 of equal length are rotatably connected to each other on a base 10.
2, 14 and upper links 16, 18 are provided in a rhombic chain shape. A block 22, which is fitted to the rotational operation shaft 20 so as to be relatively rotatable and immovable in the axial direction, is rotatably supported by a pin 24 at the left connecting part of the rhombic chain, while the right connecting part is rotatably supported by a pin 24. A nut 26, into which a male screw provided on the rotational operation shaft 20 is screwed, is rotatably supported by a pin 28, and these pins 24, 28 connect the lower links 12, 14. and above link 16,18
are connected for relative rotation.

An upper connecting member 30 having a U-shaped cross section is provided at the upper connecting part of the rhombic chain, and two connecting pins 32 and 34 parallel to each other connect one end of the upper links 16 and 18, that is, the upper end. The parts are rotatably connected to each other. A receiving member 36 is attached to the upper connecting member 30 so as to be rotatable around a substantially vertical axis, and is adapted to be engaged with a heavy object such as an automobile. In addition, at the lower connecting portion of the rhombic chain, one end of the lower links 12, 14, that is, the lower end, is connected by the two connecting pins 38 and 40 parallel to each other by the base 10 functioning as a lower connecting member. Each is rotatably connected. In this embodiment, the lower links 12 and 14 and the upper links 16 and 18 each constitute a pair of links.

Lower equalizers 42, 44 and upper equalizers 46, 48 are disposed at the lower ends of the lower links 12, 14 and at the upper ends of the upper links 16, 18, respectively. These equalizers 42, 44,
46 and 48 represent the connecting pins 38 and 4, respectively.
It is provided with meshing teeth 50, 52, 54, 56 along an arc centered at 0, 32, 34, and meshing teeth 50 and 5 of the lower equalizers 42 and 44.
2. Meshing teeth 54 of upper equalizers 46 and 48
and 56 are meshed with each other.

As shown in detail in FIG. 2, the lower link 14 has a U-shaped cross section with both side portions 58 and 60 bent at approximately right angles by press working or the like. 60 has a burring hole 6 from which a flange 62 protrudes from the inside of the U-shape.
4 are provided respectively, and the connecting pins 40 are inserted through the burring holes 64 to be connected to the base 10. On the other hand, the lower equalizer 44 has both side parts 66 and 68
is bent at a substantially right angle by pressing or the like to have a U-shaped cross section, and its back portion 70 is connected to the lower link 1 in the longitudinal direction of the lower link 14.
The lower link 14 is in contact with the back part 72 of 4.
is located inside.

Also, both sides 66, 6 of the lower equalizer 44
8 is provided with the meshing teeth 52 and a notch 74. The notch 74 is formed parallel to the back part 70 and has a U-shape with an opening at the other end of the lower link 14, that is, the side corresponding to the right connecting part of the diamond chain. By engaging the flange 62 of the burring hole 64, the lower equalizer 44 is rotated around the connecting pin 40 integrally with the lower link 14. That is, this lower equalizer 44 and the lower equalizer 42 are engaged,
For example, when the lower equalizer 42 is rotated around its center _O1 as shown in FIG.
When a force P is applied to the lower equalizer 44 on the driven side via the meshing teeth 50, 52, the lower equalizer 44 is rotated by a component force P _o and
It is pushed toward the center O ₂ by P _a . For this reason,
Since the lower equalizer 44 does not separate from the lower link 14 and its back 70 is in contact with the back 72 of the lower link 14, the connecting pin 4
Lower equalizer 44 and lower link 1 around 0
4 does not rotate relative to each other.

The lower equalizer 44 and the lower link 14 are
As shown by the white arrow "" in FIG. 2, the back part 70 of the lower equalizer 44 is
lower equalizer 4 in a posture parallel to the back 72 of
4 from one end side to the other end side of the lower link 14, the flange 62 is engaged with the burring hole 64 in the notch 74, and the flange 62 is coupled so as to be relatively unrotatable as described above. . In addition, when connecting the lower link 14 to the base 10, the lower link 1
The connecting pin 40 may be inserted by aligning the burring hole 64 of No. 4 with the pin insertion hole provided in the base 10.

The lower equalizer 44 has a larger plate thickness or is made of a high-strength material, so that its mechanical strength is higher than that of the lower link 14, and it can withstand a large load moment. There is. In addition, other equalizers 42, 46, 4
The coupling structure between the lower equalizer 44 and the lower link 14 is the same as the coupling structure between the lower equalizer 44 and the lower link 14 described above.

In such a pantograph type jack, when the rotary operation shaft 20 is rotated and the left and right connecting portions of the rhombic chain are moved toward and away from each other, the lower links 12 and 14 are connected to the lower equalizer 4.
2 and 44, the inclination angle with respect to the base 10, that is, the axis of the connecting pin 38 and the connecting pin 4
They are rotated around the connecting pins 38 and 40 in a state where their respective inclination angles with respect to the straight line connecting the 0 axis are equal to each other. Also, the upper links 16 and 18 have an inclination angle with respect to the upper connecting member 30 due to the engagement with the upper equalizers 46 and 48, that is, the axis of the connecting pin 32 and the connecting pin 34.
are rotated around the connecting pins 32 and 34 in a state where the respective inclination angles with respect to the straight line connecting the axis of the connecting pins 32 and 34 are equal to each other. As a result, the receiving member 3 attached to the upper connecting member 30
6 is raised and lowered in a constant posture in a direction perpendicular to the base 10.

Here, in the pantograph type jack of this embodiment, the equalizers 42, 44, 46, 48 and the links 12, 14, 16, 18 are configured separately, and the lower equalizer 44 and the lower link 1
4, the back portions 70 and 72 are brought into contact with each other and the flange 6 is placed within the notch 74.
2 are engaged with each other, so that the equalizers 42, 44, 46, 48 and the links 12, 1
4, 16, and 18 are each integrally connected to the connecting pin 3.
8, 40, 32, and 34. Therefore, there is no need to weld and fix them as in the past, and the mechanical strength of the equalizer 42, etc., link 12, etc. is not impaired due to the influence of heat or the notch provided for inserting the welding torch. This also reduces the manufacturing cost of the jack. Also, those links 1
Since spatter does not adhere to the second grade, the troublesome work of removing it is also eliminated.

In addition, each of the equalizers 42, 44, 46, 4
8 is connected to the links 12, 14, 16, and 18 by simply inserting them from one end side to the other end side so that they cannot rotate relative to each other, so the number of parts is small and the structure is simple. , the assembly work of both becomes extremely easy, and manufacturing costs are significantly reduced. Links 12, 14, 16, 18 as base 1
0 and the upper connecting member 30, it is only necessary to match the burring holes 64 of the links 12, 14, 16, 18 with the pin insertion holes provided in the base 10 and the upper connecting member 30. It can be done easily and quickly.

Furthermore, each of the equalizers 42, 44, 46, 4
8 have a U-shape, and meshing teeth 50, 52, 54, 56 are provided on both sides 66, 68, so that the links 12, 14, 8 can withstand a large load moment, and 16,18
The load acts evenly on both sides 58, 60 of the shaft, and no torsional moment is applied.

Although one embodiment of the present invention has been described above in detail based on the drawings, the present invention can also be implemented in other embodiments.

For example, although the pantograph jack in the above embodiment is configured with four links 12, 14, 16, and 18, it may also be configured with two or six or more links, of which at least It is only necessary that the equalizer is disposed at one end of the pair of links so that they mesh with each other.

Although no other examples are given, the present invention can be implemented with various modifications and improvements based on the knowledge of those skilled in the art without departing from the spirit thereof.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of a pantograph type jack which is an embodiment of the present invention. FIG. 2 is an exploded view illustrating the coupling structure of the jack link and equalizer shown in FIG. 1. FIG. 3 is a diagram illustrating the force acting between a pair of equalizers in the jack of FIG. 1. 10... Base (lower connecting member), 12, 14,
16, 18... link, 30... upper connecting member,
32, 34, 38, 40...Connection pin, 42, 4
4, 46, 48... Equalizer, 50, 52, 5
4, 56...meshing teeth, 58, 60, 66, 68
... Side part, 70, 72 ... Back part, 62 ... Flange, 64 ... Burring hole, 74 ... Notch.

Claims (1)

[Claims for Utility Model Registration] A connecting member having at least one pair of links and two connecting pins parallel to each other and connecting one end portion of the pair of links so as to be rotatable about the respective connecting pins; The connecting member of the pair of links has meshing teeth along arcs centered on the two connecting pins, and is provided at the one end of the pair of links and meshed with each other. a pair of equalizers that make the inclination angles equal to each other, and a pantograph type jack that raises and lowers a heavy object by changing the height by moving the other ends of the pair of links toward and away from each other, One end has a U-shaped cross section with both sides bent at a substantially right angle, and a burring hole is provided on both sides through which a flange projects inward for insertion of the connecting pin. On the other hand, the equalizer has a U-shaped cross section with the meshing teeth on both sides bent at a substantially right angle, and the back of the U-shape forms a U-shape in the longitudinal direction of the link. A U-shaped notch is disposed inside the link so as to be in contact with the back of the shape, and has a U-shaped notch on both sides parallel to the back and having an opening on the side corresponding to the other end of the link. By inserting the link from one end side to the other end side with the back parts parallel to each other, the flange is engaged in the notch and the back parts are in contact with each other. A pantograph type jack characterized in that it is coupled to the link so as to be relatively unrotatable.